WO2018216667A1

WO2018216667A1 - Rotor and motor having said rotor

Info

Publication number: WO2018216667A1
Application number: PCT/JP2018/019560
Authority: WO
Inventors: 國智顔; 秀瑛林; 耿彰呉
Original assignee: 日本電産株式会社
Priority date: 2017-05-22
Filing date: 2018-05-21
Publication date: 2018-11-29
Also published as: US11159068B2; DE112018002638T5; JP7014227B2; JPWO2018216667A1; US20210135523A1; CN108933488A; CN108933488B

Abstract

An embodiment of the present invention provides a rotor and a motor having the rotor. The rotor is provided with: a rotation shaft; a nonmagnetic rotational frame; a plurality of yokes divided and disposed within the nonmagnetic rotational frame; and a magnet disposed on at least one of the surfaces of the yokes. In order for the nonmagnetic rotational frame to hold the yokes and the magnet, the rotor comprises: a first ring-like rib disposed along the circumferential direction in the outer perimeter of the rotation shaft; a plurality of radial ribs extending along the radial direction from the outer circumference of the first ring-like rib; and a second ring-like rib being concentric with the first ring-like rib and connected to the radial ribs. The rotor is characterized in that two magnets are disposed on any one of the plurality of yokes, and the two magnets have N-pole and S-pole, respectively, on the side facing a stator. According to the embodiment of the present invention, it is possible not only to reduce the loss due to eddy current to improve the efficiency of the motor, but also to reduce cost by facilitating manufacturing of the rotor.

Description

Rotor and motor having the rotor

This application relates to the motor region, and more particularly, to a rotor and a motor having the rotor.

In the prior art, an axial magnetic flux motor in which a rotor includes a disk yoke composed of one low carbon steel and a plurality of magnets are attached to the disk yoke is often seen. Among them, the disk yoke guides the magnetic flux circuit as a magnetic guide assembly. Here, loss due to eddy current occurs in the disk yoke. For example, an axial clearance type rotary motor described in Patent Document 1 can be cited. In order to solve the problem, it has been proposed in the prior art to constitute a yoke of an axial magnetic flux motor by laminating silicon steel sheets. However, unlike a general radial motor, when a yoke as described in Patent Document 2 is manufactured by laminating silicon steel sheets, the manufacturing becomes complicated and the manufacturing cost increases.

Patent Document 1: Japanese Patent No. 5052288 Publication Patent Document 2: US Pat. No. 8836192 Publication Note that the introduction to the background art described above is a clearer and more complete explanation of the technical proposal of the present application. It is intended to make it easier to perform, and is merely provided to make it easier for those skilled in the art to understand. It should not be recognized that the above technical schemes are known by those skilled in the art only by the fact that those schemes are described in the background art section of the present application.

In the first aspect of the embodiment of the present invention, a rotating shaft that rotates about a central axis as a rotation center, a nonmagnetic rotating frame that rotates with the rotating shaft about the rotating shaft, and a nonmagnetic rotating frame A plurality of yokes arranged in a divided manner, and a magnet arranged on at least one surface of the yoke, and the nonmagnetic rotating frame holds the plurality of yokes and the magnet A first annular rib disposed along the circumferential direction on the outer periphery of the rotating shaft, a plurality of radial ribs extending along the radial direction from the outer periphery of the first annular rib, and the first annular rib A rotor composed of a second annular rib concentrically connected to the plurality of radial ribs, wherein one of the plurality of yokes includes two of the magnets, and The two magnets are on the side facing the stator Each provide a rotor, characterized in that the N and S poles.
According to a second aspect of an embodiment of the present invention, there is provided a motor including the rotor described in the first aspect and a stator disposed to face the rotor.
The beneficial effect of the embodiment of the present invention is that the loss of the eddy current generated in the rotor can be reduced because the loop of the magnetic flux path connected to the yoke is reduced, and further the efficiency of the motor can be improved.
Embodiments of the present invention are disclosed in detail with reference to the following description and attached drawings. It should be understood that embodiments of the invention are not limited thereby in scope. Within the spirit and scope of the appended claims, the embodiments of the invention include many changes, modifications and equivalents.
Used in one or more other embodiments in a similar or similar manner to the description and / or shown features of one embodiment, combined with features of other embodiments, or Can switch features of other embodiments.
It should be emphasized that the term "include / include / include" is used in the text to indicate the presence of a feature, manipulative member, or part, but one or more other features, manipulative The presence or addition of members or parts is not excluded.

れば According to the structure of the rotor, the loss due to eddy current is reduced and the efficiency of the motor is improved.

The above and other objects, features and advantages of embodiments of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic diagram of one of the rotors according to the first embodiment of the present invention. FIG. 2 is a schematic diagram of one arrangement method of the magnets and yokes of the rotor in Embodiment 1 of the present invention. FIG. 3 is a schematic diagram of another arrangement method of the magnets and yokes of the rotor according to the first embodiment of the present invention. FIG. 4 is a schematic diagram of one of the nonmagnetic rotating frames of the rotor according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view of a motor in Embodiment 2 of the present invention. FIG. 6 is an exploded view of the motor in Embodiment 2 of the present invention. FIG. 7 is a schematic diagram of a motor in Embodiment 2 of the present invention.

The above and other features of the embodiments of the present invention will become clearer according to the following specification with reference to the drawings. From the specification and drawings, specific embodiments of the present invention are specifically disclosed, and some of the embodiments that can employ the principles of the present invention are shown. However, the present invention is not limited to the described embodiments, It should be noted that all modifications, variations and equivalents falling within the scope of the appended claims are included.

In the following description of the present invention, for convenience of explanation, a direction parallel to the direction extending along the rotation axis is referred to as an “axis direction”, and a radial direction centered on the rotation axis is referred to as “ It is called “radial direction” and the circumferential direction around the rotation axis is called “circumferential direction”.
Hereinafter, a rotor and a motor in an embodiment of the present invention will be described with reference to the accompanying drawings.

Example 1
The first embodiment provides a rotor. FIG. 1 is a schematic diagram of a rotor 10 in the present embodiment, showing each component of the rotor 10 and the overall structure. As shown in FIG. 1, the rotor 10 includes a rotating shaft 11, a nonmagnetic rotating frame 12, a plurality of yokes 13, and a magnet. In FIG. 1, for convenience of explanation, only one yoke 13 and one magnet 14 are indicated by reference numerals.

In this embodiment, as shown in FIG. 1, the rotating shaft 11 rotates about the central axis OO ', and the nonmagnetic rotating frame 12 rotates together with the rotating shaft 11 about the rotating shaft 11. The plurality of yokes 13 are divided and arranged in the nonmagnetic rotating frame 12, and the magnet 14 is arranged on at least one surface of the yoke 13. Among them, the non-magnetic rotating frame 12 includes a first annular rib 121 arranged along the circumferential direction on the outer periphery of the rotating shaft 11 and a first annular rib in order to hold the plurality of yokes 13 and the magnets 14. It consists of a plurality of radial ribs 122 extending along the radial direction from the outer periphery of 121, and a second annular rib 123 concentric with the first annular rib 121 and connected to the plurality of radial ribs 122. The second annular rib 123 is located on the radially outer side of the first annular rib 121.

In the present embodiment, two magnets 14 are arranged in any one of the plurality of yokes 13, and the two magnets 14 have a north pole and a south pole on the side facing the stator, respectively ( Not shown in Figure 1). That is, two magnets 14 are attached to each yoke 13 among the plurality of yokes 13. According to the above-described embodiment, the plurality of yokes 13 are divided and arranged in the nonmagnetic rotating frame 12, and any one yoke 13 has magnets having N poles and S poles on the sides facing the stator, respectively. Two 14 are arranged. With this configuration, since the loop of the magnetic flux path connected in the plurality of yokes 13 becomes small, loss due to eddy current can be reduced. As a result, according to the embodiment of the present disclosure, the efficiency of the motor can be improved. Further, the manufacturing of the rotor can be facilitated and the manufacturing cost can be reduced. Moreover, according to the embodiment of the present disclosure, by using a plurality of divided yokes, the magnetically conductive material can be effectively used, and the amount of unnecessary magnetic material used can be reduced. Material costs can be reduced.

In this embodiment, among the plurality of magnets 14, the magnet having the north pole on the side facing the stator and the magnet having the south pole on the side facing the stator are arranged with a gap in the circumferential direction. Thereby, the magnetic flux generated by the magnet can be effectively passed through the stator on the opposite side, magnetic flux leakage can be reduced, and the performance of the motor can be improved. However, the present embodiment is not limited thereto, and for example, a gap may not be provided between magnets.

In one embodiment, two adjacent magnets arranged in adjacent yokes have the same polarity on the side facing the stator. As shown in FIG. 2, the two adjacent magnets 14a and 14b arranged in the adjacent yoke 13a and yoke 13b are both N poles. Thereby, since the loop of the magnetic flux path connected in the plurality of yokes 13 becomes small, the loss due to the eddy current can be reduced.

In one embodiment, any one of a plurality of magnets is disposed across two adjacent yokes. As shown in FIG. 3, a part of the magnet 14c is attached to the yoke 13a, and the other part is attached to the yoke 13b adjacent to the yoke 13a. Thereby, since the loop of the magnetic flux path connected in the some yoke 13 becomes small, the grade of a magnetic flux change can be reduced and the loss by an eddy current can be reduced.

It should be noted that the magnetic pole distribution of the magnet 14 shown in FIGS. 2 to 3 is only for illustrative explanation, and the magnetic pole distribution of the magnet 14 may be based on other methods.
In the present embodiment, the nonmagnetic rotating frame 12 may be made of a stainless steel material. Thereby, the loss due to the eddy current can be further reduced. However, the present embodiment is not limited thereto, and the nonmagnetic rotating frame 12 may be made of other materials.

In this embodiment, the yoke 13 may be composed of a base steel plate or a soft magnetic composite material. Thereby, the loss due to the eddy current can be further reduced. However, the present embodiment is not limited to this, and the yoke 13 may be made of other materials. For example, it may be made of S10C low carbon steel. Further, as shown in FIG. 1, the yoke 13 may have a sector shape. Thereby, a combination can be made easy. However, the present embodiment is not limited to this, and the shape of the yoke may be another shape.

In this embodiment, the yoke 13 may be fixed to the nonmagnetic rotating frame 12 with an adhesive. However, this embodiment is not limited thereto, and the yoke 13 is fixed to the nonmagnetic rotating frame 12 by other methods. May be. The magnet 14 may be fixed to the yoke 13 with an adhesive. Thereby, the structure of the rotor can be stabilized.

FIG. 4 is a schematic view of one nonmagnetic rotating frame in the embodiment of the present invention. As shown in FIG. 4, the size d1 of the first annular rib 121 in the axial direction is larger than the size d2 of the radial ribs 122 in the axial direction. Thereby, positioning can be performed. For example, the arch-shaped portion 1221 may be formed at a position where the first annular rib 121 and the radial rib 122 are connected. Thereby, d1 becomes larger than d2. However, the present embodiment is not limited thereto, and for example, the arch-shaped portion 1221 may have other shapes such as a triangle or a trapezoid.

In this embodiment, the radial rib 122 of the nonmagnetic rotating frame 12 has a size d3 of 2 mm or less in the radial direction and the direction perpendicular to the axial direction. Thereby, it was ensured that the motor had good performance.

In this embodiment, the size of the nonmagnetic rotating frame 12 in the axial direction is equal to or less than the sum of the sizes of the yoke 13 and the magnet 14 in the axial direction. For example, as shown in FIG. 4, the size d4 of the second annular rib 123 in the axial direction is not more than the sum of the sizes of the yoke 13 and the magnet 14 in the axial direction. Thereby, the motor can be thinned.

According to the rotor of this embodiment, since the loop of the magnetic flux path connected to the plurality of yokes 13 becomes small, not only can loss due to eddy current be reduced and motor efficiency be improved, but also the rotor can be easily manufactured. By doing so, the cost can be reduced.

Example 2
The second embodiment provides a rotor. FIG. 5 is a cross-sectional view of a motor in the present embodiment, FIG. 6 is a cross-sectional view of a schematic diagram of each component of the motor in the present embodiment, and FIG. 7 is an overall schematic of the motor in the present embodiment. FIG.

As shown in FIGS. 5 to 7, the motor 50 includes a rotor 51 and a stator 54 arranged corresponding to the rotor 51. The rotor 51 may be the rotor 10 in the first embodiment. The configuration of the rotor in the motor of the present embodiment is as described in the first embodiment and should be omitted here.

According to the motor of the present embodiment, since the loop of the magnetic flux path connected to the plurality of yokes 13 is reduced, not only can the loss due to eddy current be reduced and the efficiency of the motor be improved, but also the manufacture of the rotor is facilitated. Thus, the cost can be reduced.

As shown in FIGS. 5 to 7, the motor 50 further includes a bearing 52, a coil 53, a stator 54, and a casing 55. However, the present invention is not limited thereto, and other conventional members of the motor may be referred to. Good.

In this embodiment, the motor can be applied to any electric device. For example, the motor may be used as a robot joint motor or as a wheel motor for a moving carrier. In addition, the motor may be used as a motor in an electric device such as an indoor unit of an air conditioner, an outdoor unit of an air conditioner, a water server, a vacuum cleaner, a compressor, a blower, a mixer, or various information devices. It may be used as a motor in industrial equipment or the like.

The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, and a system that can use the principle of the present invention is also specified. However, it should be understood that the implementation of the present invention is not limited to the system in the above-described embodiments, and further includes all changes, corrections, and equivalents within the scope not departing from the gist of the present invention.

Claims

A rotation axis that rotates about the center axis as a center of rotation;
A non-magnetic rotating frame that rotates together with the rotating shaft about the rotating shaft;
A plurality of yokes divided and arranged in the non-magnetic rotating frame;
A magnet disposed on at least one surface of the yoke,
The non-magnetic rotating frame includes a first annular rib arranged along a circumferential direction on an outer periphery of the rotating shaft to hold the plurality of yokes and the magnet, and an outer periphery of the first annular rib. A rotor composed of a plurality of radial ribs extending along a radial direction from a second annular rib concentric with the first annular rib and connected to the plurality of radial ribs,
Two of the magnets are arranged in any one of the plurality of yokes, and the two magnets have a north pole and a south pole on the side facing the stator, respectively. .
2. The magnet having an N pole on the side facing the stator and the magnet having an S pole on the side facing the stator among the plurality of magnets are arranged with a gap in the circumferential direction. The rotor described in 1.
2. The rotor according to claim 1, wherein two adjacent magnets arranged in adjacent yokes have the same polarity on the side toward the stator.
2. The rotor according to claim 1, wherein any one of the plurality of magnets is disposed on two adjacent yokes.
2. The rotor according to claim 1, wherein the nonmagnetic rotating frame is made of a stainless steel material.
2. The rotor according to claim 1, wherein the yoke is made of a laminated steel plate or a soft magnetic composite material.
2. The rotor according to claim 1, wherein the radial ribs of the nonmagnetic rotating frame have a size of 2 mm or less in a radial direction and a direction perpendicular to the axial direction.
2. The rotor according to claim 1, wherein a size of the nonmagnetic rotating frame in the axial direction is equal to or smaller than a sum of sizes of the yoke and the magnet in the axial direction.
2. The rotor according to claim 1, wherein the yoke has a fan shape.
2. The rotor according to claim 1, wherein the yoke is fixed to the nonmagnetic rotating frame with an adhesive.
2. The rotor according to claim 1, wherein the magnet is fixed to the yoke with an adhesive.
2. The rotor according to claim 1, wherein the size of the first annular rib in the axial direction is larger than the size of the radial rib in the axial direction.
13. An axial clearance type motor comprising: the rotor according to claim 1; and a stator disposed to face the rotor.